<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
    <div th:insert="~{demo/layout/header :: header}"></div>
    <div th:insert="~{demo/layout/lefter :: menu}"></div>
    <div layout:fragment="content">content</div>
    <div th:insert="~{demo/layout/footer :: copyright}"></div>
</div>
</body>
</html>